The Light and Shadow Toddler Loose Parts STEM Kit is a laboratory of opportunity uniquely designed to inspire children to experiment and explore. Children can explore the behaviors of light and colour through geometric builds using the chunky, transparent pieces made from solid acrylic. Keep pieces organized using the included compartmentalized plastic tray. The smallest part measures 4cm L x 4cm W (1-1/2' L x 1-1/2" W).